污水厂污泥在亚/超临界丙酮中的液化行为

利用直接热化学液化技术,在1000mL的反应釜中,考察了液化温度、污泥/溶剂配比(R1)、催化剂以及溶剂填充率(R2)对污水厂污泥在亚/超临界丙酮中的液化行为的影响.结果表明,约300℃条件下,污泥液化较为彻底,过低或过高的温度液化效果反而较差.当温度超过340℃时,丙酮溶剂参与反应能力增强,促进油产率的增加,至380℃时油产率保持稳定.在其他液化条件相同的情况下,发现污泥在R1为10/200、R2为20%、添加5%剂量的NaOH作为催化剂,获得较好的液化效果.红外光谱(FTIR)和气相色谱/质谱分析(GC-MS)分析表明,生物油的主要成分是含氮杂环、羧酸、酯、酮等化合物,主要的官能团包括胺基、羟基、烷基和羰基等.

Thermochemical liquefaction characteristics of sewage sludge in the sub-and supercritical acetone

Direct thermochemical liquefaction was adopted to convert sewage sludge into bio-oil, and the influences of the temperature, the ratio of sewage sludge to solvent (R_1), catalyst and the volume ratio of solvent to reactor (R_2) on the characteristics of the liquefaction of sewage sludge were investigated with the sub- and supercritical acetone as the solvent in a 1000mL autoclave. It was shown that the sewage sludge was basically converted at about 300℃, while at higher or lower temperature, the effect of liquefaction was worse. When the temperature was higher than 340℃, the ability of the acetone involving in the reaction obtained enhancement so that the yield ofbio-oil was improved as far as 380℃. As other liquefaction conditions were consistent, the liquefaction of sewage sludge could gain a better effect at R_1 10/200, R_2 20% and adding 5% dosage NaOH as the catalyst. The FTIR (Fourier transformation infrared spectromcter) and GC-MS (gas chromatography-mass spectrometry) analyses indicated that heterocyclic nitrogen compounds, earboxylic acid, ester and ketone were the main components of the bio-oil and amidocyanogen, hydroxyl, alkyl and carbonyl were the main functional groups.